Spline combination structure drilling tool with centering and pre-tightening functions

Abstract

The utility model relates to a kind of tooling of spline combination structure drilling, and the tooling can realize the quick alignment positioning of spline combination structure drilling and provide centering pre-tightening function.A kind of spline combination structure drilling tooling with centering pre-tightening function, the tooling includes centering pre-tightening assembly, base and V-shaped block assembly;Centering pre-tightening assembly includes support base, compression plate and screw rod, along the height direction of support base, there is sliding slot for the up-down sliding of compression plate, and recessed groove is arranged in the height direction of support base, compression plate includes upper compression plate, lower compression plate, and threaded hole and through hole matched with screw rod are respectively arranged in the opposite position of upper compression plate and lower compression plate, left and right screw threads are respectively selected for the upper and lower sections of screw rod, and convex shoulder matched with recessed groove is arranged in the middle, for limiting the axial movement of screw rod.The utility model realizes the function of quick centering;Realize clamping pre-tightening;Provide reverse compensation thrust for broken edge structure drilling;Realize stable processing.

Description

Technical Field

[0001] This utility model relates to a tooling for drilling spline combination structures. The tooling can realize quick alignment and positioning when drilling spline combination structures and provide centering and pre-tightening functions. Background Technology

[0002] Spline assembly structures are coaxial pairs consisting of internal spline parts (such as various spline shafts) with multi-tooth structures and external spline parts (such as various spline sleeves) connected by key teeth. They are widely used in various couplings, pumps, dampers, and other mechanical components. To limit the axial movement of the internal and external spline parts after connection and to reduce clearance, the external spline part is often designed with a broken edge structure before being drilled with the internal spline part. Bolts are then inserted into the drilled holes for fastening. The bolt tightening causes a slight deformation of the external spline part, reducing clearance, while the connection between the bolt's shaft and the drilled hole further improves stability.

[0003] In the past, drilling operations for spline assembly structures typically relied on a fitter marking and positioning the internal spline parts, then using V-blocks to position and clamp them, and finally using pressure plates to fix the external spline parts before drilling, reaming, and boring the holes directly according to the fitter's markings. This processing method has the following drawbacks: First, it is inefficient, requiring a significant amount of time for clamping and alignment; second, the external spline parts remain in a free state during processing, resulting in a certain degree of deviation from the final tightened state; and third, due to the broken edge structure of the external spline parts, some features will inevitably be incompletely cut during the drilling process, making it prone to off-center drilling. Utility Model Content

[0004] The purpose of this utility model is to provide a spline combination structure drilling tool with centering and pre-tightening function. This tool not only realizes the rapid positioning of the spline combination structure, but also realizes the functions of centering, pre-tightening clamping and guiding drilling.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a spline combination structure drilling fixture with centering and pre-tightening function, the fixture including a centering and pre-tightening component, a base and a V-block component, both of which are mounted on the base; the centering and pre-tightening component includes a support base, a pressure plate and a screw, a sliding groove for accommodating the pressure plate to slide up and down is provided along the height direction of the support base, and a concave groove is provided in the height direction of the support base; the pressure plate includes an upper pressure plate and a lower pressure plate, and threaded holes and through holes matching the screw are respectively opened at the relative positions of the upper and lower pressure plates; the upper and lower sections of the screw are respectively selected with left-hand and right-hand threads, and a shoulder that cooperates with the concave groove is provided in the middle to restrict the axial movement of the screw.

[0006] Preferably, the centers of motion of the upper and lower clamping plates are on the same plane as the center of the V-shaped block assembly.

[0007] Preferably, a quick-change drill sleeve is provided in the through hole of the upper clamping plate, and the quick-change drill sleeve is fixed to the upper clamping plate by fastening screws; a fixed drill sleeve is provided in the through hole of the lower clamping plate.

[0008] Preferably, a groove A is provided at the bottom of the support base, the groove A is adapted to the protrusion A on the base, and can slide along the length direction of the protrusion A; the support base and the base are fixed by tightening bolts.

[0009] Preferably, the V-block assembly includes a V-block base and a V-block pressure plate; a groove B is provided along the length direction of the bottom of the V-block base, the groove B is adapted to the protrusion B on the base, and can slide along the length direction of the protrusion B; the V-block pressure plates are arranged in groups, one end of which is fixed to the V-block base, and the other end is an open end, and is connected by fasteners.

[0010] Preferably, the relative positions of the centering pre-tightening component and the V-block component are adjustable.

[0011] Instructions for using this tooling: Step 1: Fix the fixture on the drilling machine, guide the drilling position with the drill bushing on the fixture to determine the drilling position, and then fix the spindle position; Step 2: Install the assembly on the fixture, and clamp and pre-tighten the internal spline parts using the V-block assembly on the fixture; Step 3: Rotate the screw to drive the two pressure plates to move synchronously and clamp the external spline parts; Step 4: Start the drilling machine to drill, ream, and correct the hole, changing the quick-change drill sleeve in sequence.

[0012] Compared with the prior art, the present invention has the following advantages: 1. This fixture utilizes a bidirectional screw in conjunction with a precision T-slot to guide the upper and lower pressure plates to move synchronously for centering, and works in conjunction with the V-block to achieve rapid centering. 2. The self-locking effect of the screw thread is used to achieve clamping pre-tightening; 3. The upper clamping plate is equipped with a quick-change drill sleeve, which can provide guidance for drilling and reaming processes and provide reverse compensation thrust for drilling of edge-breaking structures; 4. It has achieved centering pre-tightening, rapid clamping, and stable machining of spline combination structure drills. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the assembly structure of the embodiment of this utility model and the spline combination structure; Figure 2 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 3This is a schematic diagram of the centering and pre-tightening component structure in an embodiment of this utility model; Figure 4 This is a cross-sectional view of the centering and pre-tightening component in an embodiment of this utility model (a, front view; b, sectional view). Figure 5 These are schematic diagrams of the drilling and reaming / boring processes according to embodiments of this utility model (a, top view; b, enlarged view AA (drilling the bottom hole); c, enlarged view AA (reaming / boring)). Figure 1 In the diagram, 1-spline assembly structure; 1.1-internal spline component; 1.2-external spline component; 2-tooling; Figure 2 In the middle section, 2.1-alignment pre-tightening assembly; 2.2-tightening bolt; 2.3-base; 2.4-V-block assembly; Figure 3-5 In the middle section, 2.1.1-Upper clamping plate; 2.1.2-Fasting screw; 2.1.3-Quick change drill sleeve; 2.1.4-Support base; 2.1.5-Lower clamping plate; 2.1.6-Screw; 2.1.7-Fixed drill sleeve. Detailed Implementation

[0014] It should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed during use. They are only used to facilitate the description of this utility model and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0015] The following is in conjunction with the appendix Figure 1-5 Further details of this utility model: A spline combination structure with centering and pre-tightening function for drilling tooling, such as... Figure 2 As shown, it mainly consists of a centering pre-tightening assembly, a base, and a V-block assembly. The centering pre-tightening assembly 2.1 and the V-block assembly 2.4 are installed and fixed on the base 2.3 by tightening bolts 2.2.

[0016] Specifically, such as Figure 3 As shown, the centering pre-tightening assembly 2.1 mainly consists of an upper clamping plate 2.1.1, a lower clamping plate 2.1.5, a quick-change drill sleeve 2.1.3, a support base 2.1.4, and a screw 2.1.6. The upper and lower clamping plates are driven by the screw 2.1.6 to clamp the parts.

[0017] like Figure 3-4As shown, the upper and lower sections of screw 2.1.6 use left-hand and right-hand precision threads respectively. The middle shoulder precisely engages with the concave groove on the base to restrict axial movement. The upper and lower clamping plates engage with the support base through precision T-slots, restricting all degrees of freedom of the upper and lower clamping plates except for axial movement. This ultimately achieves the self-centering motion of the upper and lower clamping plates when screw 2.1.6 is rotated. The centers of motion of the upper and lower clamping plates are on the same plane as the center of the V-block assembly 2.4, thus enabling rapid centering and positioning of the assembly through their cooperation. The self-locking effect of the threads on screw 2.1.6 effectively ensures the clamping effect and provides preload to eliminate spline fit clearance.

[0018] like Figure 3-5 As shown, the upper clamping plate 2.1.1 is equipped with a quick-change drill sleeve 2.1.3, and the lower clamping plate 2.1.5 is equipped with a fixed drill sleeve 2.1.7. A step is provided on one side of the quick-change drill sleeve 2.1.3. The quick-change drill sleeve 2.1.3 is pressed onto the upper clamping plate by fastening screws 2.1.2 and threaded holes on the upper clamping plate 2.1.1. The quick-change drill sleeve 2.1.3 can be replaced with drill sleeves of different inner diameters according to the needs of drilling and reaming, providing upper guide support for drilling and reaming. The fixed drill sleeve is provided on the lower clamping plate 2.1.5, which is mainly used for lower guide support for reaming and reaming. The reverse compensation thrust provided by various drill sleeves can effectively avoid the off-center drilling phenomenon of the edge breaking structure.

[0019] How to use tool 2: 1. Fix fixture 2 on the drilling machine, guide the drilling position with the drill bushing on the fixture to determine the drilling position, and then fix the spindle position; 2. For example Figure 1 As shown, the spline assembly structure 1 is installed on the tooling, and the inner spline part 1.1 is clamped and pre-tightened using the V-block assembly on the tooling (if the position accuracy of the inner and outer spline parts is required, the position can be adjusted using adjusting shims). 3. For example Figure 4-5 As shown, use a socket wrench to rotate the screw, which will cause the clamping plate to clamp the external spline part 1.2. At this time, the center position of the part is completely determined. Lock the V-block pressure plate, and then start the drilling machine. First, drill the hole, and then change the drill bushing for reaming. Then, change the reaming drill and reamer with upper and lower guides in sequence to complete the reaming process.

[0020] As a preferred embodiment of this example, the support base and V-block assembly of the centering pre-tightening component adopt a waist-shaped hole and precision groove structure. The centering pre-tightening component can be adjusted in position in the horizontal direction, and the V-block assembly can be adjusted in position in the vertical direction to adapt to drilling work with different position requirements.

[0021] Different sizes of drill holes can be achieved by changing quick-change drill bushings; due to the good guiding function of the drill bushing, drilling work can be completed using ordinary small vertical drills or even electric drills when equipment capacity is limited.

Claims

1. A spline assembly structure drill fixture with centering and pre-tightening function, characterized in that: The tooling includes a centering preload assembly, a base, and a V-block assembly. Both the centering preload assembly and the V-block assembly are mounted on the base. The centering preload assembly includes a support base, a pressure plate, and a screw. A sliding groove for the pressure plate to slide up and down is provided along the height direction of the support base, and a concave groove is provided along the height direction of the support base. The pressure plate includes an upper pressure plate and a lower pressure plate. Threaded holes and through holes matching the screw are respectively opened at the relative positions of the upper and lower pressure plates. The upper and lower sections of the screw are respectively left-hand and right-hand threads, and a shoulder that mates with the concave groove is provided in the middle to restrict the axial movement of the screw.

2. The spline assembly structure drilling fixture with centering and pre-tightening function according to claim 1, characterized in that: The centers of motion of the upper and lower clamping plates are on the same plane as the center of the V-block assembly.

3. The spline assembly structure drilling fixture with centering and pre-tightening function according to claim 1, characterized in that: A quick-change drill sleeve is provided in the through hole of the upper clamping plate, and the quick-change drill sleeve is fixed to the upper clamping plate by fastening screws; a fixed drill sleeve is provided in the through hole of the lower clamping plate.

4. The spline assembly structure drilling fixture with centering and pre-tightening function according to claim 1, characterized in that: A groove A is provided at the bottom of the support base, which is adapted to the protrusion A on the base and can slide along the length of the protrusion A; the support base and the base are fixed by tightening bolts.

5. The spline assembly structure drilling fixture with centering and pre-tightening function according to claim 1, characterized in that: The V-block assembly includes a V-block base and a V-block pressure plate; a groove B is provided along the length of the bottom of the V-block base, the groove B is adapted to the protrusion B on the base, and can slide along the length of the protrusion B; the V-block pressure plates are arranged in groups, one end of which is fixed to the V-block base, and the other end is an open end, which is connected by fasteners.

6. The spline assembly structure drilling fixture with centering and pre-tightening function according to claim 1, characterized in that: The relative positions of the centering preload assembly and the V-block assembly are adjustable.

Images